Air filter



p 1940- G. E. ma 2,213,233

.AIR FILTER Filed March 11, 1939 EIBUEEJE TIEINEP BY INVENTI R' Patented Sept. 3, 1940 UNITED STATES PATENT OFFICE AIR FILTER. George E. Tigner, Taft, Calif. Application March 11, 1939, Serial No. 261,285

2 Claims.

This invention relates to improvements in air filters and has particular reference to an air filter for internal combustion engines and the like. It is, however, obvious that the same might be applied to air conditioning, the purpose being to strain dust from the air.

A further object is to produce a device of this character which permits of a free flow of air through the air conditioner, and yet one which will collect the dust therefrom.

A further object is to produce a device of this character which is simple in construction and, therefore, economical to manufacture.

A still further object is to provide means for removing the dirt collected within the device.

A still further object is to produce a device which is compact and readily adaptable to the standard motor equipment.

Other objects and advantages will be apparent during the course of the following description.

In the accompanying drawing forming a part of this specification and in which like numerals are employed to designate like parts throughout the same,

Fig. 1 is a side elevation of my device, having a portion thereof broken away;

Fig. 2 is an enlarged fragmentary detailed view, showing a portion of the filter surface;

Fig. 3 is a fragmentary sectional view, showing -an enlarged cross section of the bottom; and

Fig. 4 is a top plan view of Fig. 3.

The ordinary air filter usually introduces a filtering medium through which the air passes, such a medium being steel wool coated with oil,

or spun glass coated with oil; and this type of filter impedes the free travel of the air, through the filter.

7 I have, therefore, devised a filter which permits the free flow of air.

In the accompanying drawing wherein for the purpose of illustration is shown a preferred embodiment of my invention, and by viewing Fig. 1!, it will be noted that the numeral 5 designates a casing having an inlet pipe 6 covered with a screen I. An outlet pipe is shown at 8. The bottom of the casing 5 is shown at 9 and is held to the casing by bolts II. This bottom is held to the casing 5' against a gasket l2 and has its inner surface provided with a plate I! having raised projections thereon. A baille is also formed at It. Within the casing 5 is a circuitous passage it, which is formed by the introduction of traps, l1, l8, l9, and 2!. Each trap consists of a plate extending out into the casing bent uponitself so as to form a pocket, and the inner surface of the casing is lined with sheet metal'22 having inwardly punched out openings 22' provided with sharp edges. (See Fig. 2.) In order to simplify the drawing, this material 22 is partially eliminated from Fig. 1.

' dust particles, and the same will be true in the trap 2 I. The baflle l4 and removable bottom will arrest the balance of the dirt so that when the 15 air passes up the passage 23 and out the pipe 8, it will be thoroughly cleaned. The grater-like material 22 causes the dirt to form into little pellets which gradually accumulate and finally drop off into the traps. I have found that the introduction of this material is highly important in that fine dirt could be carried through. the device but by forming pockets and points for this fine dust to collect, the same will accumulate into heavy particles and finally reach one 25 of the traps.

It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same and that various changes relative to the material, 30

"size, shape and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims. Having thus described my invention. 1 claim: 1. In an air conditioner, a casing, a removable 35 bottom therefor, said bottom having a trap formed therein and having its bottom inner surface covered with aplate provided with raised portions forming pockets thereon, a circuitous passage formed through said casing, dirt traps 40 formed in said passage, and a lining within said passage and formed of sheetmetal having inwardly punched openings provided withsharp edges adapted to collect the dust. 2. In an air conditioner, a casing, traps formed 45 in the bottom of said casing, a plate covering said bottom and provided with raised portions forming pockets thereon, a circuitous passage formed through said casing, horizontal dirt traps formed in said passage and arranged in stage gered relation, and a lining within said passage and formed or sheet metal having inwardly punched openings provided with sharp edges adapted to collect the dust.

GEORGE E. TIGNER. 

